Double pulley



April 14, 1931. SCHULTZ 1,800,664

DOUBLE PULLEY Filed May 10, 1928 E 1: WARD Ecnuzmz Patented Apr. 14, 1931 UNITED STATES PATENT OFFICE EDWARD SCHULTZ, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE NAGEL-GHASE MANU- FAGTURING COMPANY, OF CHICAGO, ILLINOIS, A. CORPORATION OF ILLINOIS DOUBLE PULLEY Application filed Kay 10, 1828. Serial No. 276,670.

The principal object of this invention is to provide a double pulley that is economical in manufacture and durable in use.

A further object of this invention is to 5, provide a double pulley that may be easily secured on or detached from a shaft, as a sin le unit.

still further object of this invention is to provide a double pulley that is light in to weight and not easilv broken. v

A still further'object of my invention is to rovide a double pulley of absolute uniibrmity and one that will not readily wear the belts running upon it.

More specifically, the ob]ect of this invention is to provide a double pulley comprising a hub member secured to two identical outer shell members and two identical inner shell members secured to the outer 2o shell members.

Theseand other objects will be apparent to those skilled in the art.

My invention consists in the construction, arrangement and combination of the various parts of the device, whereby the objects contemplated are attained as hereinafter more fully set forth, ointed out in my claims and illustrated in t e accompanying drawings, in which:

Fig. 1 is an end view of my complete pulley ready for use.

Fig. 2 is a side view of my pulley with a portion cut away to more fully illustrate its construction.

Fig. 3 is a perspective view of one of the two identical outer shell members stamped from sheet metal.

Fig. 4 is a perspective view of one of the two identical inner shell members stamped from one piece of sheet steel or other suitable material.

F i 5 is a perspective view of the hub member of the device made of suitable metal.

The tendency of modern devices and machines is toward compactness, lightnessfa'nd strength. To obtain this, the manufacturers are turning more and more to stamped steel parts to replace the old time heavy castings. This is especially true of pulleys and like parts. However, steel stamped pulleys have.

additional advanta es over cast iron ones,

such as their smoot driving faces as compared to the rough faces of cast iron pulleys, which are also subject to sand and air holes, and their indestructibility as compared with easily broken cast iron. Many machines require two or more pulleys on a single shaft which require separate installation and are cumbersome as well as unrefined in appearance. I have overcome these disadvantages by my stamped steel double pulley, as will bet appreciated by those familiar with the ar However, to successfully make a steel stamped double ulley that will successfully stand up under lieavy duty indefinitely and yet be economical in manufacture, calls for special construction and design.

The two outer shell ortions of my device are exact duplicates of each other, stamped from one piece of sheet steel or other suitable material. By being duplicates, the requirement of two separate dies is eliminated, which reduces the manufacturing cost considerably, facilitates the factory assembling and standardizes the two parts so that a true running pulleyis assured. I have designated the base or central portion of each of these shell members by the numeral 10,

at the outer edge of which is the flared ortion 11. Integrally formed on the marginal edge of the flared portion 11 is the offset 12,

parallel to the axis of the assembled pulley and formin a shoulder, the purpose of which will ereinafter be explained. Inte' grally formed on the ofl'set 12 is a forwardly extending portion 13 extending in the same plane as the central portion 10 and upon the outer marginal edge of which is the second flared portion 14, which provides one of the driving side faces of the device. The numeral l4 designates a laterally extending peripheral flange, parallel with the oiiset 12 and integrally formed on the outer edge of the flared portion 13, on each of the outer shell members, which vprevents. shar edges from damaging the belt running on t e pulley and so stren hens the same that it is almost indestructible and reduces to a minimum, any possibility of the driving face becoming construction.

bent or otherwise distorted from its normal shape. The two inner shell portions of the device are also exact duplicates of each other, stamped from one piece of sheet steel or other suitable material and therefore, do

not require separate dies for each. This,

like the one set of dies for the outside shell.

portions, reduces the manufacturing cost and facilitates the assembling as well as guaranteeing "a (pulley of even balance. I have designate the flat or central portions of each of these inner shell members b the numeral 15 at the outer edge of which 15 the voffset 16 to form an annular shoulder. In-

tegrally formed on the offset 16 is a flared portion 17 at the outer edge of which is a forwardly extending peripheral flange 18. The numeral 19 designates a cylindrical hub membermade of any suitable metal and designed to embrace in the common and well known manner, a shaft upon .which the device is to be used. This hub member has one of its ends reduced as shown in Fig. 5, designated by the numeral 20, and designed to extend through the hole 21 in each of the outer shell members. This reduced end 20 has a flat face 22. In assembling this device, the washer 23 is first placed on the reduced end 20, followed by the two outer shell portions with their backs together and with the two inner shell portions with their two forwardly extending flanges together and between the two outer shell portions, as shown in Fig. 2. On the marginal edge of each of the holes 21 is an inwardly extending segmental projection 24, designed to engage the face 22 and thereby prevent an relative movement of the pulley to the hu 19. The washer 25 is next placed on the reduced end 20 and the outer edge of that reduced end hammered or otherwise spread to form the head 26, thereby permanently securing the pulley to the hub. B

this arrangement, the inner marginal e ge of the central portion 15 of each of the inner shell members rests on and is supported by the annular shoulder 12 of one of the outer shell members respectively, and each of these central portions are ad acent the forwardly extending portion 13 of one of the outer shell members respectively,as shown in Fig. 2, thereby 'makln a very rigid and compact To prevent each of the members 13 and 15 from receding from one another, they are spot welded, as shown in Fig. 1 and desi ated by the numeral 27. The two centraI portiOns'IO of the outer shells are greatly strengthened when assembled by thewasher 23 on one side engaging the enlarged portion of the hub member 19 and the washer 25 on the opposite side thereof engaging the head 26. The offset 16 of each of the mner shells not only reduces the amount of flare of the ortions 17 and 14, but greatly strengthens t esame. It should 'here be noted that the forwardly extending peripheral flange 18 on each of the inner shel members when assembled, extend beyond the circumference of the laterally ex tending peripheral flanges 14 of each of the outer shell members. This construction provides an easy accessible place for spot welding the two inner shell members together and which is designated by the numeral 29. These flanges 18 tend to guide the belts into their respective grooves and to hold them a slight distance apart so that they will not engage one another.

If the device is to be secured to a shaft, it may be easily done by merely tightening the single set screw 30, threaded into the hub 19.

Such a double pulley as above described, never develops sand or air holes and if perchance, it comes in contact with some powerful resisting force, it might be bent, but would not break. Such a bent pulley can easily be straightened and then it is as good as new.

From the foregoing described construction, it will readily be seen that I have provided an economical stamped steel pulley of pleasing appearance and one that is light and of great strength.

Some changes may be made in the construction and arrangement of my improved double pulley without departing from the real spirit and purpose of my invention and it is my intention to cover by my claims any modified forms of structure or use of mechanical equivalents which may be reasonabl included within their scope.

claim 2- 1. In a device of the class described, a hub member, two outer shell members secured to said hub member, and two inner shell members wholly supported on the inner sides of said two outer shell members for forming a double pulley.

2. In a device of the class described,,a hub member, two outer shell members each an exact duplicate of the other secured to said hub member, and two inner shell members each an exact duplicate of the other wholly supported on the inner sides of the said two outer shell members for forming. a double V-pulley.

3. In a device of the class described, a hub member having one-of its ends reduced, two outer shell members secured to said reduced end, and two inner shell members secured to and wholly supported on the inner sides of said two outer shell members for forming a double V-pulley.

4. In a device of the class described, a hub member-having a reduced portion, two outer shell members each an exact duplicate of each other secured to said reduced portion, and two inner shell members each an exact duplicate of each other wholly supported on the sides of the said outer shell members for forming a double pulley.

5. In a device of the class described, a hub member having a reduced end, two outer shell members on said reduced end, two inner shell members supported on the inner sides of said two outer shell members for forming a double pulley, a Washer on said reduced end engaging the outer side wall of one of said outer shell members and said hub member, a second washer on said reduced end engaging the outer side wall of the other outer shell member, and a head formed on the outer edge of said reduced end for pre venting the removal of the last mentioned washer.

6. In a device of the class described, a hub member, two shell members secured to said hub member each comprising a central disk portion, a shoulder formed on the marginal edge of said disk and a flared portion extend- -ing from said shoulder, and two inner shell members each engaging and supported by one of the oifset portions respectively.

5 7. In a device of the class described, a hub member, two outer shell members secured to said hub member, an outwardl extending eripheral flange on each of said shell memers, and two inner shell members secured to I and supported by said two outer shell members each comprising a central portion, a shoulder formed on the marginal edge of said central portion and a flared portion extending from said shoulder.

8. In a device of the class described, a hub member, two outer shell members secured to said hub member each comprising, a central portion, a eripheral shoulder at the outer edge of sai central portion, a fiat portion integrally formed on the outer edge of said shoulder and extending transversely of the longitudinal axis of said hub member, a flared portion integrally formed on the outer edge of said last mentioned portion, two in- 5 ner shell members each having a fiat annular side wall engaging and contacting one of the transversely extending portions and shoulders respectively, and a means for securing each of said transversely extending portions and side walls to%ther, respectively.

DWARD SCHULTZ. 

